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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423d218c3bdf7e9a95398cc0535d101fbaad516169584165ed437f0a5e24c1e9' 
  AND token = 'x2hxP/9paZKqqY2+thaDcoJj+j8IK8x/2Rtz0ISs1LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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