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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1937309344266ff50e63579ff4c16b1d77fbd4ec477c5db01c3d32e5cea21f42' 
  AND token = '32eTY/FrlrIjqHNAcdqIDZL2j3nlAU/OsmT4uzomQis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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