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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c3d103c10b2cb254ba598724f56d8d7db51973a03ddb06561c2ddb305e985b' 
  AND token = 'jq9UgLmx3MGXYEeKY6bfZF46yMPF+ZpNbn6OPwIE3Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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