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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07e704ed0a55e19af07e2e038cf7212bce27a6b00d44ae2c1cac8f9495b690a' 
  AND token = 'JaUmi0KfEHdeIxLxtAtlXv1O5IQTzmGXlcmGDGCPRgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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