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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1823e55400817ca22584d1a1d3a6dbca719fcdc07cb3aec4116de31d64805109' 
  AND token = 'xaB65zzFmIQxpVdtLe3O8Qk4kaXeB2FxCFVyypAMURk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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