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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31945ca3ae9d9f1e185e28bbef1116be72f42fb8098dd6071c96ca3a55855b8e' 
  AND token = 'oE2K/w3zKvO8H3+a/55H+FLx8Rq7RNKz1vLI7sgkEDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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