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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b1b632dbf715faa3285ac0afbcc8349a175211b36305b94c00167371a97f243' 
  AND token = 'fCg3uyHeMQsFpqy0oWwEZaXAJ0bmWrX4ycFRalU0s+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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