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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e704cdc8875e5f694bf7ae85cc62cfe2aff1f23e8f5b10c01d7787fdcdf77360' 
  AND token = 'p+VJuYak51JPLE/Zh5MiI7dH1Znc7c8XuWnfg60iOGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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