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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c90f34f1b76094782eff48aaa448b23f19bdc41ff3d979ca39f4ca2c225f828' 
  AND token = 'zmyPksyAgIsMXmQcPjxc1+nFD696Az03VjFqUT4AMBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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