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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5a07e12b43a53fbbdb86b2ab0d3061a15ba00409a5db00ef5853b4f29ea323' 
  AND token = 'iIshrVLUolwqYEwuHbwRB64RGICFqhpcmAA0yteFB3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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