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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00083ed9aea8f7d89a143a03b571f915f333f5ccc7dcfbd9ecbd8393819e704b' 
  AND token = 'QiCGkl0Ldu24xvflgRH2Q37LYbmYOynHc/zoj7Ubgqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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