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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2673f9b8a31e91fb8246866ded5c9c3d3333a00bb06154beddc067667b7a12' 
  AND token = '8odv8AotqpzPS1w4smAq1cUP+Aw9crasouXH+in9d2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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