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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c057413afd515fd23cf1d21044907b87ba19bd6701035c4d27be5f15770e8cce' 
  AND token = 'OammwgTKTBZ0ccE9qsclJEbzraJuXrL6LJwIWjS8GuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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