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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4de383dc6f06f96345c926f0cd64b580435262e5a5eb19c6cd2638c7fa50719' 
  AND token = 'dicBAq39pqPMBZ0UxaSZp57sTMVd+LFxr755AiAS/7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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