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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81eab528096199e49ef92858caad71eaf22c44980bd03c60a8d51b42dd4b0707' 
  AND token = 'ZsJHnISVnxEbEuk9u7j0FnCnzM4KEFBnh/orvv0byr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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