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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7fdb373c238c3dadda2562b712af2c0503b6ba9429217a5b620d95343270570' 
  AND token = 'w/g9LuaTpqtbyvjByQ/Kjr0vI8mmKy3ocmlmuJtKg7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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