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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b4ce5a614c0e40fe1de9cee4c9ac64c08d4ff243b40857aa323397b096cdb2' 
  AND token = 'xtk8sa+WrvCI2INVrr1LqzaykQvzxB2WyPTXcIemLG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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