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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d184e66312229835b08a02d5e61cac71c407692f3262869e253549f9ff0510' 
  AND token = '/i0oQs7aKOGZk6Hkq8de3S7tD/mPTZRrpdYrXAOATjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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