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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e426e53de002442e7442ec88ef45e478ebbe53f2a6fe1edb134cd0c0abb18c1a' 
  AND token = 'bEWxzRwlLeAGpyiLXnUl46vgiXOQLYW+Pln7U0veess=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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