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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0fcbe68003ea36c5091a78d2265f921fe3186910ed2206624fbd56b3b3e78a' 
  AND token = 'DfjF5OgsrvgZh3i0xtIn3Q7DoL/4b5CBcOtNOqVp2g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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