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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aef9af74fa3e9b936d384fdcd9c34d88ad13084599a4de71e20a4243d651ae3' 
  AND token = '2ZzTa/CKUO8kQvezZI+FPUD5uAi+/Oj3m0QO+NF3P4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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