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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176d5f6f79619d9b42dee9f114a8b40571d2b34817d042a8f7181e3d8e1ada27' 
  AND token = '6jmYRfQGvjbFQpokuh5JJUJisVL8fpGPJ3ncCbl1SG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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