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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe8a7dca85c97f18321e607396a2d81232c3185be133b2885a03c4c8f83a1b7' 
  AND token = 'ChsxQx2A4J+2U81T684P56weybePKulxFhL89PfX/f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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