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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7ad22fa95b94f1542534ce04b1ca6c169db2fe96e318284cdfbd899465e2c3' 
  AND token = '9Sw1UF6zHnHRpnTe5a2XQaMGH/wiT9yifLxov+EE1vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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