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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7cc62781136ceef26a2da88ae059072aa3f5657c75e68e315f8b63afac019eb' 
  AND token = '7yyyLl14uGPBEGJc3FuVYUrMAP4JfrAFlBZeV6u4W6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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