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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5214b49e3da8738a0acc4b5f29dda569a497304765bc2289f103d6c83a7c8bd5' 
  AND token = 'qif1j99ZSe8Gp4gospK0KVZRVNo9dTf8nTy2xY05/tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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