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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1fbc8e7260e5e0b92db0b62c429b35ab637d3cd368c25f5e2ab0af881ec2746' 
  AND token = 'N9/t4ReDK+09KJKLup3xFE6WDaIl1PV/REbYn/rYqd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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