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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45e2e5db8f70e62776ab1d49ab27a73fe88e1e719b813c091e04035d89fd75a' 
  AND token = 'WVIJ6NcxhjAPNdservfZH/mtCTVRiIpmOEF/S6mEC8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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