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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd79cff5e25243d26507bdc3a74b29c1627947b1ab0dba7eb88c4fb3dc68e43' 
  AND token = 'C21BsCqlUHYi31FHyeFaD6ybmN0Khd90BOzPZa/uvL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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