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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f413997c44fba95486e759ac80dbb906da67214c7f30ebcf9163be562b2e4f4' 
  AND token = 'iPX2/SFlT8HPu/UD5N1atuPOI6/6vrtdL1GPnyF4v0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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