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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e85473f0cffd743b4f22dbaa70d3177b325a523819a3431e3d9030d91c6b159' 
  AND token = 'MEQImI/+6xv35CHQFEY+80AGpS8WzFe/WcOQ7J3mBb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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