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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e2c0f0c134aac776992eaca2a78d40ea69bbd30b0807f5d0ba62b09231f19c' 
  AND token = 'qnr4McH9OVgkz+RJRZW+3MfrNV3Mb1Vf7PJMVW8ET+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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