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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bcdf4d62598b2e7ff4e5d3551e3f11454bdfb249210c9b2f047bb7176d9070e' 
  AND token = 'qLENgJindOfLpxa5dTAtfxfmFmlBpe4P3kWrPS22R2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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