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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00df29ecf6db92df26d6ecda167ee9fafbd114ccf4c5efcbc7eb66ede1f0701f' 
  AND token = 'fm4DP3fKfxl4CgSsyAN2iklcJDuzgie60H2i060Ir58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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