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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfde2aa2dca04bb604ec2ea128e06e677742bb1f39fb5279066f3e3051018a85' 
  AND token = 'JKLeWPebYTbZBImesEiI/10dQ5ba89K484CrFzj2Vmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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