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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a7c85b1e8b3d747617f3d0412b5337decc3c21b1ac35b8d7e76be6bb673743' 
  AND token = 'VKYryf8KuyzA+hXu1Fxvi3joHFmqwyemWDBK4w2OsMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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