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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec31cb46a9c1a1430f6f65823119612678fb2ac7296b9b132e38e101a3060ef' 
  AND token = 'pGX5CyMpUvm2180QTE3GBKqDEPJ0VwSGN1GE3Dzmqic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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