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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24e0ac92b6ba9b09b4c4b2b556b27d3a0cb50513ae8234bc3e10edb72a87eb4' 
  AND token = 'YCyfpmF2CL4w+6mxpTHTs1tgbwmih0j4jH4XswZy8Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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