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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f22e030e5474d83211799887f3d2f0168b91e47c059c640285419ecd64d22c' 
  AND token = 'JXSmlQUCUS+ITKNftj2mdAYB4PbLynfnH72sa3424Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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