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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff023ef1426c0d4e0be85b4f2cc39f1e6f660aa7cf04ae08ba585a82fed6c1a' 
  AND token = '36FYGFyomxfX57RVAk1LSjyBbOR0Lu5uRt8oEkkORaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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