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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a679c7e5ceb387d869bd8ad5d9bba7afff3c3891cc33f2c15c03408e3e45d7e7' 
  AND token = 'px9+DIvRKEqRoP37r2NcFzKNuL6wJADNSvTDYV1JOXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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