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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6430140605c3f27a0266881b46360120d13e647167eb544f5fd3365fe29f3c2c' 
  AND token = 'PLiNm2oz1RJK8MVDNtIoL2TEVYK029R3RRoJ4LB6pfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00229

JSON explain

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