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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ca902d8a14cb703087a361e317bf9c98dd6924c6f0fc27b81baf804dc0f60a' 
  AND token = '29cOQP4FutRvQzSm9MA5rEakeUFG2gla0dId7HjcE8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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