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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf52552ac648f02882fe27881ae8eddeabebdbc8d80fd7dd48ee8bcebb6a114' 
  AND token = 'wo9Hb9ENY/HL6chjEOnM/B6rSqTjzCEsKI6pADPd8yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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