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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1221a93a780f4cf6c174bf1ea83271dbab250ccdeff8e9139cd8d3bb62e0207b' 
  AND token = 'JT9uiePhkCvmk8jIFDYthkb3bYSs1dr0QqclrqdZuuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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