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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f59f4070362c2eea87427ce0bdc32b4c8ecf58ea314d445b8d333607add32b' 
  AND token = 'OBfVjOiME2ZBq0eez3LHx7pc8ktGIm9FdYsgPDwqjrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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