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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b900a214bdc72329281a309058a28b2c8f8b788da8d41a12bba2ecc8062e15' 
  AND token = '/z+kd12V6Nu5IlcdQGJsPt+ug58+oAj3h0/BcZj39Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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