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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee07dbdba429cecfc0eac2d226fb2cccdf48696f8cc9765f747ed41b824714a' 
  AND token = 'VMwt6wRL2RiVJQQtxYKV1dyFkEAJJJRj6x50G7/ayKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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