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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4237733027b4e36f6f6095539cdc4477ecb717e6eced46c4ad5b8b47322883d' 
  AND token = 'uyHaihR00Lls8Elq+SQWRGC/9B0+EbZyrUbu6A7yvlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}