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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab2ea51d84ca9386e71df56fcf64cf7100a7d55708a54f51efbf9a4a7ddf415' 
  AND token = 'SxW+ZdxVkj/Qovqoo2iluBnPBCPS+HjDIreNUF+h3EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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