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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4270132c01893840a5e66d3d103856359e257bc49767bb179f27afb1c39483b' 
  AND token = 'EawRVIHJ1aeXK3ME/8k/XoA0x3Ck8qn+rsDtC49y+bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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