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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b77dc0bce8c70d42c153ff4e527ab25d983b07fc70c269d2fc972c8828c1d8d' 
  AND token = 'UtcaHbwEmcNFyKxdh9aGDDoLRH/LthYuVfFffnnwhcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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