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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '343e2604f05bbdf3be1b4ebe88679dbd9789b8c98fd3966a69f253dee610e247' 
  AND token = 'a21hx916CiJSe4vHjAy9t0b41+vcC+xuep4Qg3Rhv3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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