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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960cd8b8a22bff466f88e06dd7e38eb40924bc4c3718f29292f2c23a9fc70ae8' 
  AND token = '9xAdOreCiR6EumHs1Ado3iENK6EaraTgmJ99ILQIo+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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